It's as big and heavy as all your other lenses put together and then some and it doesn't have any built-in image stabilization. It's harder to handle than any other EF lens out there but if you can mount it on a rock solid tripod and head and practice your long lens technique to the point of obsession then the rewards are there to be taken because this lens has quite outstanding optics. Mine is the more recent DG version but by all accounts the non-DG version is just as impressive.

Let's get this archive started with some recent bird photographs. First a couple of Robin shots:

I can't believe no one has replied to this thread yet. The quality is amazing. I love the light spot behind the Robin. The moon passing behind clouds one is also quite different from other moon shots. It had a Halloween mood to it, but the detail of the moon also made it realistic. Congrats on this lens and your skill

Hey Scoobs congrats on the Sigmonster; it's one amazing lens. There's no need to stop down up to around 750mm and after that f/7.1 is usually enough to bring back the prime-like sharpness. You'll need to chase that little predator away if you want to do some back garden birding though!

I recommend the sturdiest tripod you can lay your hands on and for a head the Manfrotto 393/3421 is just perfect for this lens.

Here's another robin wide open @536mm from the garden this morning - first fine weather we've had in 2009 and I'm looking forward to stretching the legs of this lens some more this year.

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